Mold for constructing hollow concrete columns.



No. 840,637. PATENTED JAN. s, 1907'.

- v1?. LOCHBR. A

MOLD PUROONSTRUGTING HOLLOWGONGRBTB COLUMNS.

. APPLICATION -FILED NOV. l0I 1906.

2 SHEETS-SHEET l.

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q "il A Winesses No. 840;@37. l PATLNTLDJAN. O, 1907.

.y P. LOOHLL. MOLD FOR OONSTROOTINO HOLLOW CONCRETE OOLUMNO.

APPLICATION FILED NOV. 10. 1906.`

2 SHEETS-SHEET 2.

' purr-.En fsrarns TENT orrrsc FaiTziLocinEa, or ZRICH@ SWITZERLAND, QASSIGNOR ro THE FIRM Ior Localia a empor zmcH, swirzERLAuD.

luoLD Fora@c:crisi-suonare HoLrow ooNcnE-rE wootuwuas.`

To all, whom zit mctyicortcfn:

Be it known that I, FRITzLooHEYma citif zen of the Republic ofSwitzerland, resid-ing ,at Zrich,A Switzerland., have invented cer-I ta1n. new` and useful Improvements `in Molds,

for`Constructing Hollow Concrete Columns and I do hereby'declarethe'following to be afull, clear, and exact description of theinvention, such as will enable others `skilled in the specification.

The sub`ect of my invention is an appara-` hollow beton or concrete pil-- "tus for ma ing larsor columns.

The new apparatus consists of arnold com-v posed of a plurality of superposeld detachvably-connccted sections each com irisng an outer shell and a core inclosed by the same.

One forniof construction of the invention is illustrated in the accompanying drawings, in which y Figure l is a side elevation; Fig. 2, avertical section through tht lower portion of Fig. 1 drawn to a larger scale; Fig. 3, across-sec tion on the line A B of Fig. 2; Fig. 4, a crosssection through. a concrete column 'constructed by means of the apparatus, and Fig. 5 a sectionalview illustrating the structure employedf'or supporting the mold when making such a concrete column.

` y' The apparatusv consists o fa mold comarms d, by means of which' the sections can.

posed of a number of su erimposed sections a, each comprising a shcl b, having a slightlyconical taper in upward direction, and a similarly-tapering core c, inclosed bythe shell. The' cores are' so 'located relatively to the shells that between the former and the latter an annular space remains extending throughout the entire heightof the mold. From' the rear side -of the shell-sectionsthere project be detachably secured to vertical bars e. These bars are fixed to a framework or scaffold T, having platforms or stages E, to

which the workmen can ascend by steps or' 2ladders L. Each shell-section b is split into p y l Sipiecipfeation, of Letters Patezlit.l

Appleman fudfroyeabervio,1906. summe. 342,921.

two halves b b2, of which the former turns on- .I y'flugs 7L ofthe part b inthe mannerofa--hasp,

.whereby the two halves b b2 can be lockedv together, as shownfin Fig `etAt the bottom ofV 't 1e cores spiders, or

transversel'membersk are provided,in'which k.are suspendedboltsi, the heads-ifiof which ,are of elongated rectangular sha e. `The boss of the spiders is provided with e ongated slots lc to receive the bolt, and to revent rotation ofthe latter the neck of the olt-shank, which ,'liesfwithin the'l boss, is rectangular. Thebolts pass farther through the elongated 'rectangular slots Z in the s iders s at the tops of the cores.

bottom of the annular space'between shells and cores-that is to say, is destined to support the column to be erected. In thevhcly h The tails oA the bolts i terminate-1n elongated rectangular pieces locatedv low foot is avertically-adjustable support p, I

on which the bottom core-section stands.

To construct a column, I proceed inthe following manner: On the foot n all the shellsections are erected, and on the sup port p to start with yonly the lowest core section, whereupon the annular space between the shell and the core of this lowest column-section .is filled out with concrete. On the bottom core-section the next higher one is now set and the space between shell and core then filled out with concrete, as before, and sc on, working from platform to platform until all the sections have been erected one upon the other and the annular spaces between shells and cores filled up with concrete. During this procedure the core of the mold must be turned from time to Vtime by rotation of the c support, the motion of the latter being transmit tedto the core above bymeans of the dow e1- pins m. The purpose of this rotation of the core-atintervals is to prevent the concrete mass from adhering to the wall of'the core. When the concrete `in the mold has hardened, the core has to be withdrawn. For this pur-- pose the top core-section is suspended from the structure T and the. support lowered, .whereupon all the core-sections (except the top one) will descend also, "The descent of the support is continued until the -s iders s of the cores strike the tailpieces i2 of t e bolts fi,

ICC

1c bolt i passes through the slot lyin transversely to the slots Z, so that the who e of the cores and bolts hang one from the other. This concatenation of cores and bolts is then further lowered until the core of 5 the bottom column-section entirely leaves the shell, whereupon this Vcore is detached e from the one above it. This is done by the N bottom core being rotated relatively to the next higher one until the tail iece i2 of the of the bottom c ore. The concatenation of cores is then ylowered in any suitable manner until the origipenultimate core (now,the ultimate or, lowest one) entirely leaves the mold, Where;A 5 upon this core is detached, and so on until all 'the cores are removed from the mold. f TheV nally vparts b of the shells arethen flap ed back on their hinges f, so that the hol ow column formed by the concrete which 'has been iiled intovthe annular space between cores and shells can be removed laterally. The crosssection of such a column is seen in Fig. 4. .This column is reinforced by means of wires q, running longitudinally of. the column, and

wires 'rrunm transversely to the same.

ity Ao1" superlposed sections, located vwithin the said mol( and detachable members connecting the individual core-sections together, substantially as described.

t2. In apparatus for making hollow concrete columns, in combination, a tubular mold, consisting of a plurality of superposed sections; a hollow core, consisting of a plurality of hollow sections, located within the said mold transverse members having elongated slots, loc'ated at the ends of the cores;

and bolts having elongated heads and tailpieces passing througlvthe slots of each two `adjacent transverse members, the distance between the head and tail Yof the bolts being greater than the distance between the top of one transverse member and the bottom of the adjacent one; substantially as described.

3. In apparatus for making hollow concrete columns, in combination, a tubular mold, consisting of a plurality of superposed sections; a hollow core, consisting of a plurailty of superposed sections, located within themold; and dowel-pins on the end of each core entering recesses in the adjacent end of the next core; substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribin f witnesses.

FR TZ LOGI-IER.

Witnesses:

En. Loenen, A. LIEBERKNECHT 

